<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>数据统计</el-breadcrumb-item>
            <el-breadcrumb-item>数据报表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <div ref="myChart" id="main" style="width:750px;height:400px;"></div>
        </el-card>
    </div>
</template>

<script>
import echarts from 'echarts'
import _ from 'lodash'
export default {
    data() {
        return {
            options: {
                title: {
                    text: '用户来源'
                },
                tooltip: {
                    trigger: 'axis',
                    axisPointer: {
                        type: 'cross',
                        label: {
                            backgroundColor: '#E9EEF3'
                        }
                    }
                },
                grid: {
                    left: '3%',
                    right: '4%',
                    bottom: '3%',
                    containLabel: true
                },
                xAxis: [
                    {
                        boundaryGap: false
                    }
                ],
                yAxis: [
                    {
                        type: 'value'
                    }
                ]
            }
        }
    },
    async mounted() {
        const myChart = this.$refs.myChart
        if (myChart) {
            const thisChart = echarts.init(myChart)
            //准备数据和配置项
            //发送请求获取折线图数据
            const { data: res } = await this.$http.get('reports/type/1')

            if (res.meta.status !== 200) {
                return this.$message.error('获取折线图数据失败')
            }
            //合并数据
            const result = _.merge(res.data, this.options)
            thisChart.setOption(result)
            window.addEventListener("resize", function() {
                thisChart.resize();  //页面大小变化后Echarts也更改大小
            });
        }
    }
}
</script>

<style lang='less' scoped>
</style>